IPPmedia
These include proteins, sugars, amino acids, lignin cellulose and many others. They usually exert their biological effect within the cell of the organism ...

Inventors Corner: Wood stockImperial College London (blog)
Wood is made up of, in a roughly even split, cellulose, hemicellulose and lignin. Of these, cellulose and hemi-cellulose can be used in the production of biofuels; they can be converted through biological processes into sugars, and then alcohol.